Thieds to edwin euthven whitney and ohaeles lucien bosse



./ (No Model.)

J. A 1. GRAIG.

ELEGTRIG LAMP.

No. 249,016. Patented Nov. 1,1881.

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UNITED STATES PATENT. OFFICE.

JOSEPH A. I. CRAIG, OF MONTREAL, QUEBEC, CANADA, ASSIGNOR OF TWO THIRDSTO EDYVIN RUTHVEN WHITNEY AND CHARLES LUOIEN BOSSE,

BOTH OF SAME PLACE.

ELECTRIC LAM P.

SPECIFICATION forming part of Letters Patent No. 249,016, dated November1, 1881,

Application filed July 20,1881. (No modelJ T all whom it may concern: IBe it known that I, JosEPH A. I. CRAIG, of the city of Montreal, in thedistrict of Montreal and Province of Quebec, Canada, have inventedcertain new and useful Improvements in Electric Lamps; and I doherebyde- .clare that the following is a full, clear, and exactdescription of the same.

My invention relates to improvements in the to general construction andarrangement of the several parts going to make up an apparatus or lampfor electric lighting, and has for its object to provide, in cheap andsimple form, an efficient article, which shall be also adapted,

I5 without alteration, for any position, whether in a hall or building,whereit can be suspended or hung from a bracket, &c., or for outsidepurposes, where itwill be found speciallysuitable for being supported ina post or in any way which might be found desirable.

The special features ofmy improvements may be brieflydescribed asfollows: The lower or negative carbon is fed upward toward the positivecarbon, which is held stationary and 2 suspended bya yoke or strapextending upward from a cylindrical casing, which incloses a framecarrying the electro-magu'ets, armatures, and the mechanism employed forlowering the negative carbon, the rod carrying this latter'passing downthrough this cylindrical chamber and through a collar projecting fromthe frame, and on which pulleys carrying aweightareattached,andtherod,pulleys,weight, and collar are i-nclosed byatube screwed to the under side of the cylindrical casing abovementioned.

For full comprehension of my invention reference must be had to theannexed drawings, in which similar letters of reference indicate 40 likeparts, and where- Figure 1 represents an elevation of my improved lampFig. 2, a vertical sectional elevation of same; Fig. 3, a transversevertical section on line U U, Fig. 4, said Fig. 4 being 4 5 a sectionalplanltaken on the line XX, Fig. 3;

and Fig. 5 is a detail showing device for lowering rod carrying negativecarbon.

A represents the cylindrical chamber or casing, which is sore wed orotherwise attached to a flange or cover, A, which flange or covercarries on its under side a frame, A inside the walls of which areplaced two electro-magncts, B B, provided with an armature, I), whichhas two pins extending from its upper side and sliding in sleeves b I),attached to the frame A and the armature is also furnished with twoscrews,

1 1, for regulating length of are. This armature also supports and hasaffixed thereto one end of a collar, (shown in detail in Fig. 5,) N,which encircles a rod, 0, which carries the lower or negative carbon, 0,and slides up and down through the center of the frame A sleeves c and 0being provided therefor, as shown. The collar 1) is held up against thelower end of the sleeve 0 by any suitable springs. A supplementarymagnet, D, is also placed within the frame A where shown, and furnishedwith an armature, d, of the form indicated-via, a strap the ends ofwhich pass,

as shown in Figs. 3 and 4, underneath the armature b, and are pivoted,as indicated at d d, to the frame. This magnet I) is connected by wireswith the positive and negative poles Y and Z of the lamp, as shown at dd in Fig.

2, and the magnets B B are connected to each 7 other in the usual way,and by means of a brush or other. device, D to the rod U, holding thenegative carbon. To aid in moving this rod G upward as the carbon isconsumed, I attach to the sleeve 0" a series of pulleys, E, round whichpass cordse 0, one end of each being attached to a revolving plate, 0pivoted to the end of O, and their other ends tied to a hollow weight,F, which encircles the rod 0, thus permitting same to pass freely up and8 down. A tube or casing, G, screwed to A incloses this mechanism.

To carry the positive carbon h, I arrange a yoke or strap, H, in theform and position shown in Fig. 1-viz., extending .upward from 0 thecover A of the casing A, being insulated therefrom, but connected to thepositive pole Y by a wire, 3 as shown in Fig. 2.

In lighting the lamp the electric current is directed to the positivepole Y, whence it passes through the wire y to the yoke H, from which itgoes to the carbons in the usual way, and passes down through the rod 0,and by means of the brush b is communicated to the electromagnets B B,the strength of the current in which attracts the armature I), and thusdraws the collar b down at one 'end, which has the effect, as will beunderstood from the detail in Fig. 5, of gripiug the shaft 0 anddrawingthe same downward, which, of course, separates the carbons andforms the voltaic arc. WVhen the current in the magnets B 13 becomesweakened from the increased length of the are, brought about by theconsumption of the carbons, the extra strength of the current brought inat the positive poleY will pass through the wire d into thesupplementary magnet D, and thus attract to the latter the armature d,the ends of which will then raise the armature b from its contact withthe magnets B B, the upward moven'ientof the collar b aided by theweight F below, having the effect of raising the rod 0, and thusbringing the negative carbon 0 close up to the positive point h, whenthey are again lighted and the current is once more diverted to themagnets B B, which then attract the armature I) and form the are betweenthe carbons.

I am aware of the patent of Kellogg, No. 229,536, dated July 6,1880, andI do not broadly claim the invention therein shown.

Having thus described. my invention, I beg to state that what I claim isas follows:

1. In an electric lamp, the combination of a fixed carbon, a movablecarbon supported on a vertically-sliding rod, electro-magnets B- B,whose helices are electrically connected to rod carrying movable carbon,and with armature and the described connections, whereby said armatureis adapted to draw down the rod 0, a weight for raising said rod, asupplemental electro magnet in a permanentlycloscd shunt, and providedwith an armature and lever adapted to act upon and raise the firstarmature, whereby the movable carbon is permitted to rise when thedistance between the carbons has increased, substantially as described.

2. lhe combination of the magnets 13 B, armature b, collar W, with itssprings, with the rod 0 and weights adapted to raise the same, and withthe supplementary magnetD and armature d, the latter being adapted tooperate upon the armature b, said devices having electrical connections,as described, and all being combined in the manner set forth.

3. The combination of the case A, yoke H, supporting the upper carbon,and tube containing the magnets 13, B, and D and their armatures, andelectrical connections, as described, with the rod 0, supporting thenegative carbon, the tube G, and the weight F, all as set forth.

JOSEPH A. T. CRAIG.

Witnesses:

It. ARTHUR KELLoND, S. HAMILTON CLARKSON.

